feature(input): implement keyboard layouts and utf-8 input subsystem

* Adding keyboard layout (backend)

* Update settings.c with new keyboard tab

* Fixing keyboard icon && Fixing long loading time in settings.c

* Refactor of key handling for a larger compatibility with the keyboard layout

* Adding keyboard handler

* Udating ps2.c with the new logic

* Updating WM/kernel/userland with the new input system

* Fixing keycode range && Updating dead keys handling

* Add comments for explanation

* Update notepad & vm.c to parse utf-8

* Adding utf-8 parsing utils in libc && Update notepad.c

* Adding icon for icon settings

* Fixing a warning with double definition

* Adding new kb kayout: QWERTZ and DVORAK && Update new layout instrauction

* Add documentation for keyboard input subsystem

This document outlines the architecture and design of the input subsystem, focusing on keyboard input processing, driver responsibilities, keycode representation, and keymap functionality.

---------

Co-authored-by: boreddevnl <chris@boreddev.nl>

src/sys/syscall.c

@@ -22,14 +22,17 @@
 #include "tty.h"
 #include "font_manager.h"
 #include "graphics.h"
+#include "input/keycodes.h"
+#include "input/keymap.h"
 #include "app_metadata.h"
 
-extern bool ps2_ctrl_pressed;
-
 #define SPAWN_FLAG_TERMINAL 0x1
 #define SPAWN_FLAG_INHERIT_TTY 0x2
 #define SPAWN_FLAG_TTY_ID 0x4
 
+#define SYSTEM_CMD_SET_KEYBOARD_LAYOUT 49
+#define SYSTEM_CMD_GET_KEYBOARD_LAYOUT 51
+
 // Read MSR
 static inline uint64_t rdmsr(uint32_t msr) {
     uint32_t low, high;
@@ -158,10 +161,17 @@ void syscall_send_mouse_up_event(Window *win, int x, int y) {
     user_window_mouse_up(win, x, y);
 }
 
-static void user_window_key(Window *win, char c, bool pressed) {
+static void user_window_key(Window *win, int legacy, uint16_t keycode, uint32_t codepoint, uint32_t mods, bool pressed) {
     process_t *proc = process_get_by_ui_window(win);
     if (!proc) return;
-    gui_event_t ev = { .type = pressed ? GUI_EVENT_KEY : GUI_EVENT_KEYUP, .arg1 = (int)c, .arg3 = (int)ps2_ctrl_pressed };
+
+    gui_event_t ev = {
+        .type = pressed ? GUI_EVENT_KEY : GUI_EVENT_KEYUP,
+        .arg1 = legacy,
+        .arg2 = (int)keycode,
+        .arg3 = (int)mods,
+        .arg4 = (int)codepoint
+    };
     process_push_gui_event(proc, &ev);
 }
 
@@ -2105,6 +2115,16 @@ static uint64_t sys_cmd_get_elf_primary_image(const syscall_args_t *args) {
     return app_metadata_get_primary_image(path, out_path, out_size) ? 1 : 0;
 }
 
+static uint64_t sys_cmd_set_keyboard_layout(const syscall_args_t *args) {
+    keymap_set_current((keymap_id_t)args->arg2);
+    return 0;
+}
+
+static uint64_t sys_cmd_get_keyboard_layout(const syscall_args_t *args) {
+    (void)args;
+    return (uint64_t)keymap_get_current();
+}
+
 #define SYS_CMD_TABLE_SIZE 78
 static const syscall_handler_fn sys_cmd_table[SYS_CMD_TABLE_SIZE] = {
     [SYSTEM_CMD_SET_BG_COLOR]        = sys_cmd_set_bg_color,
@@ -2152,6 +2172,8 @@ static const syscall_handler_fn sys_cmd_table[SYS_CMD_TABLE_SIZE] = {
     [SYSTEM_CMD_SET_RESOLUTION]      = sys_cmd_set_resolution,
     [SYSTEM_CMD_NETWORK_GET_NIC_NAME] = sys_cmd_network_get_nic_name,
     [SYSTEM_CMD_PARALLEL_RUN]        = sys_cmd_parallel_run,
+    [SYSTEM_CMD_SET_KEYBOARD_LAYOUT] = sys_cmd_set_keyboard_layout,
+    [SYSTEM_CMD_GET_KEYBOARD_LAYOUT] = sys_cmd_get_keyboard_layout,
     [SYSTEM_CMD_TTY_CREATE]          = sys_cmd_tty_create,
     [SYSTEM_CMD_TTY_READ_OUT]        = sys_cmd_tty_read_out,
     [SYSTEM_CMD_TTY_WRITE_IN]        = sys_cmd_tty_write_in,

src/sys/syscall.h

@@ -100,7 +100,9 @@ typedef struct {
 #define SYSTEM_CMD_SLEEP 46
 #define SYSTEM_CMD_SET_RESOLUTION 47
 #define SYSTEM_CMD_NETWORK_GET_NIC_NAME 48
+#define SYSTEM_CMD_SET_KEYBOARD_LAYOUT 49
 #define SYSTEM_CMD_PARALLEL_RUN 50
+#define SYSTEM_CMD_GET_KEYBOARD_LAYOUT 51
 #define SYSTEM_CMD_TTY_CREATE 60
 #define SYSTEM_CMD_TTY_READ_OUT 61
 #define SYSTEM_CMD_TTY_WRITE_IN 62